It works for me - when it works at all. There are still blocked periods, but when the story flows, it is mostly from the drive of the characters.
It also helps me to be able to "flesh them out," or see them and hear them. Spend some time thinking about your characters' appearance, maybe do a character sketch, or think of someone you know or an actor whose work resonates for you.
It also helps to know the setting of the story. If you haven't been there, and can't go there, google the place, or if it is an imaginary place, write a description. Make it as vivid as you can. If it is a real place, study its history. Use the blocked periods to intensify the elements in your mind through these activities.
For me, the actual plot just grows out of those elements. The better I know them, the more often the story flows on its own.
Ann